2009ApJ...699..667M


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.18CEST10:08:07

2009ApJ...699..667M - Astrophys. J., 699, 667-685 (2009/July-1)

Mid-infrared spectroscopy of submillimeter galaxies: extended star formation in massive high-redshift galaxies.

MENENDEZ-DELMESTRE K., BLAIN A.W., SMAIL I., ALEXANDER D.M., CHAPMAN S.C., ARMUS L., FRAYER D., IVISON R.J. and TEPLITZ H.

Abstract (from CDS):

We used the Spitzer Infrared Spectrograph (IRS) to study the mid-IR properties and investigate the energetics of 24 Submillimeter Galaxies (SMGs). This is the largest sample of SMGs observed with Spitzer IRS and covers the full extent of properties of the radio-identified population of SMGs in the redshift range of z ∼ 0.65-3.2. We observe broad emission features from polycyclic aromatic hydrocarbons in more than 80% of our sample. We find that the median mid-IR spectrum is well described by a starburst component with an additional power law, Fν∼ ν–2, likely representing a <32% contribution from an active galactic nucleus to the bolometric luminosity. Our results thus confirm that starburst activity dominates the bolometric luminosity in SMGs. We find that SMGs show weaker silicate absorption at ∼9.7 µm than local ULIRGs. We also find stronger 6.2-µm PAH emission in SMGs (relative to the 7.7 µm PAH feature) than in local nuclear starbursts, which may be attributed to lower extinction by ice along the line of sight to SMGs. This suggests that the continuum and PAH emitting regions of SMGs are less obscured than in local starbursts and similarly luminous low-redshift ULIRGs. We interpret these results as evidence for a more extended distribution of cool and warm dust in SMGs compared to the more compact emitting regions in local ULIRGs and starbursts. Together these results suggest that SMGs are not simple high-redshift analogs of nuclear starbursts or local ULIRGs, but instead they appear to have star formation which resembles that seen in less-extreme star-forming environments at z ∼ 0-suggesting their intense activity is distributed across a far larger region than the ∼1 kpc nuclear bursts in local ULIRGs.

Abstract Copyright:

Journal keyword(s): galaxies: high-redshift - galaxies: starburst - infrared: galaxies - submillimeter

Simbad objects: 39

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Number of rows : 39

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Mrk 1014 Sy1 01 59 50.2529351498 +00 23 40.874250335   16.08 15.87     ~ 522 0
2 NAME SMM J02399-0136 G 02 39 51.87 -01 35 58.8       21.20   ~ 179 2
3 NAME SMM J030227.73+000653.5 AGN 03 02 27.8 +00 06 54   23.8 19.10   21.29 ~ 37 0
4 NAME SMM J030231.81+001031.3 smm 03 02 31.65 +00 10 30.5   26.4 26.40     ~ 13 0
5 2MASX J05210136-2521450 Sy2 05 21 01.3987198411 -25 21 45.269338983   15.47 14.75     ~ 441 0
6 UGC 5101 Sy1 09 35 51.599 +61 21 11.33   15.20 15.50     ~ 519 4
7 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5445 6
8 NAME SMM J105151.69+572636.0 smm 10 51 51.690 +57 26 36.09   27.28   25.20 23.99 ~ 39 0
9 NAME SMM J105158.02+571800.2 G 10 51 58.018 +57 18 00.27   25.78   24.54 23.67 ~ 35 0
10 NAME SMM J105200.22+572420.2 EmG 10 51 59.856 +57 24 24.91   22.95   22.05 21.53 ~ 35 0
11 NAME SMM J105227.58+572512.4 G 10 52 27.58 +57 25 12.4           ~ 10 0
12 NAME SMM J105238.19+571651.1 G 10 52 38.256 +57 16 51.31       22.70 22.66 ~ 14 0
13 NAME SMM J10524+5724 smm 10 52 38.299 +57 24 35.76   26.45   24.90 24.21 ~ 37 0
14 LEDA 39024 LIN 12 13 46.107 +02 48 41.50           ~ 315 1
15 NAME SMM J123549.44+621536.8 AGN 12 35 49.4 +62 15 37 24.6 23.9 23.6 23.3 23.1 ~ 52 0
16 NAME SMM J123553.3+621338 G 12 35 53.24 +62 13 37.5   24.8     23.89 ~ 20 1
17 NAME SMM J123600.1+620254 G 12 36 00.10 +62 02 53.5   25.7     24.42 ~ 11 0
18 NAME SMM J123600.2+621047 QSO 12 36 00.1526 +62 10 47.527 24.21 25.5874 25.35   24.6340 ~ 49 0
19 NAME Chandra Deep Field-North reg 12 36.8 +62 13           ~ 623 0
20 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 962 1
21 NAME SMM J123707.2+621408 AGN 12 37 07.2086 +62 14 08.499 28.12 26.8993 26.6 25.6 25.3860 ~ 101 0
22 NAME SMM J123711.32+621331.3 AG? 12 37 11.260 +62 13 30.87 25.3 24.9032   23.8 24.7226 ~ 50 1
23 NAME SMM J123721.87+621035.3 Sy2 12 37 21.859 +62 10 35.75 24.2 23.8312 23.80 22.8 21.8676 ~ 36 0
24 Mrk 273 Sy2 13 44 42.164 +55 53 13.53   15.68 14.91     ~ 840 3
25 2MASX J14373831-1500239 Sy1 14 37 38.317 -15 00 23.97   16.58 16.40     ~ 248 1
26 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2739 4
27 NAME SMM J16363+4056 smm 16 36 39.01 +40 56 35.9   24.6 23.60   22.44 ~ 27 0
28 NAME SMM J163650.43+405734.5 AGN 16 36 50.5 +40 57 34   23.3 23.30   21.83 ~ 83 0
29 NAME SMM J163658.8+405733 smm 16 36 58.78 +40 57 28.1   23.9   22.50 21.55 ~ 27 0
30 NGC 6240 Sy2 16 52 58.861 +02 24 03.55   14.31 13.37     ~ 1515 2
31 NAME SMM J221733.02+000906.0 G 22 17 33.02 +00 09 06.0   24.5     24.90 ~ 9 0
32 NAME SMM J221733.12+001120.2 G 22 17 33.132 +00 11 19.86   22.8     20.23 ~ 11 0
33 NAME SMM J221733.91+001352.1 G 22 17 33.96 +00 13 51.9   24.8       ~ 12 0
34 NAME SMM J221735.15+001537.2 G 22 17 35.15 +00 15 37.4   26.1       ~ 18 0
35 NAME SMM J221735.84+001558.9 AGN 22 17 35.86 +00 15 59.4   27.332 25.881 25.468 24.57 ~ 37 0
36 NAME SMM J221737.39+001025.1 AGN 22 17 37.4 +00 10 25   25.1 25.10   23.69 ~ 12 0
37 NAME SMM J221804.42+002154.4 G 22 18 04.42 +00 21 54.4   25.2     23.07 ~ 13 0
38 NAME SMM J221806.77+001245.7 G 22 18 06.77 +00 12 45.7   25.8     23.36 ~ 8 0
39 NAME South America H2G 22 51 49.307 -17 52 23.96   16.97       ~ 290 3

    Equat.    Gal    SGal    Ecl

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2021.04.18-10:08:08

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